Awhile back I was refererd to Vellus products! and it is great although I have to use greentea and oatmeal on sami due to his itching.. but I must say I bought the Vellus shampoo in Feb 2005 and I still have 2 big bottles shampoo & conditioner, it's concentrated and you just make up shampoo & condintioner in smaller bottles.
I love the way it makes tilly's hair so soft & shiny, she is 11 yrs and her coat has gotten dull over the years, but this product makes her blonde hair Blonde and really shiny and smells so clean.. although a bit pricey it does last forever. It's custom designs grooming formulas for animals.
http://www.vellus.com/